Sometimes a video comes along that just truly brings all kinds of happiness to ones heart.

This is one of those times.

Jeff Tweedy, of the band Wilco, appeared at the launch party for Dan Sinker's novel The Fucking Epic Twitter Quest of Mayor Emanuel, and instead of promoting his upcoming album or playing one of his tunes, he decided to perform THIS absolutely AMAZING version of the Black Eyed Peas' My Humps.

Ch-ch-check it out (above)!

We promise - you may be a little bewildered, but you will not REGRET it!

"My metabolism actually changed like crazy this year. I have Hashimoto's disease. It's a thyroid disease, and it's now been two years since taking the medication for it, so for the VS show I didn't want to lose any more weight, I just want to have muscles in the right place, and if my butt can get a little perkier, then that's good."